Display Device Controlling the Switching Device to Perform Modulation Control of Output Voltage of Transformer and Method for Controlling the Display Device

2. The display device of claim 1, wherein the controller is configured to control the output voltage to follow the reference voltage by changing an operation phase of at least one of the plurality of switching devices based on the output voltage.

7. The display device of claim 1, wherein the controller is configured to control the plurality of switching devices to control the output voltage to follow the reference voltage based on a difference between the output voltage and the predetermined reference voltage.